臺灣博碩士論文加值系統

LAS-CDMA是連宇公司根據北京郵電大學李道本教授發明專利所發展的系統，其展頻及編碼方式使用LAS編碼架構，以降低系統產生之干擾，並達到增加系統容量之目的。
LAS-CDMA與現行三種3G之標準均有相對應版本，且其chip rate、carrier spacing、frame length、core network architecture及protocols均相同。LAS-2000為3GPP2(Third Generation Partnership Project 2)組織規範cdma2000標準系列之延伸版，其語音及數據容量可達IS-2000的三至六倍。W-LAS為3GPP(Third Generation Partnership Project )組織規範UTRA W-CDMA標準系列之延伸版，其語音及數據容量可達W-CDMA的三至十二倍、TD-LAS為3GPP規範UTRA TD-CDMA標準及中國規範所提之TD-SCDMA兩者之延伸版，其語音及數據容量可達TD-SCDMA的三至十二倍。
本文針對LAS編碼架構，評估其基本特點及討論干擾之抑制，並分別對現有文獻有關LA code、LS code及兩碼合併後之LAS code之設計架構提出改善方法，以達到更有效且具彈性之LAS code。

LAS-CDMA system, developed by LinkAir based on the invention patent of Professor Daoben Li in Beijing University of Posts and Telecommunications, is characterized by the use of a spreading and encoding scheme called LAS coding that reduces system generated interference, thus increasing capacity.
It is understood that each of the current 3G standards has its counterpart in a mode of LAS-CDMA for the same chip rate, carrier spacing, frame length, core network architecture and protocols. Furthermore, LAS-2000 is an evolution of the cdma2000 series of standards defined by the Third Generation Partnership Project 2 (3GPP2) and supports from 3 to 6 times more voice or data capacity than IS-2000. W-LAS is an evolution of the UTRA W-CDMA series of standards defined by the Third Generation Partnership Project (3GPP) and supports from 3 to 12 times more voice or data capacity than W-CDMA. TD-LAS is an evolution of the UTRA TD-CDMA series of standards defined by the Third Generation Partnership Project (3GPP) and of the TD-SCDMA proposed by China and supports from 3 to 12 times more voice or data capacity than TD-SCDMA.
The thesis gives an investigation on the LAS coding scheme to evaluate the basic features of the LAS-CDMA concept and a discussion on the interference suppression. To generate efficient and flexible LAS codes, some contributions can be found to improve the properties of known design schemes to LA, LS and LAS codes in the literature.

目錄
中文摘要……………………………………………………………………..i
英文摘要……………………………………………………………………ii
目錄…………………………………………………………………………iv
圖目錄……………………………………………………………………..viii
表目錄…………………………………………………………………….xi
第一章緒論.………………………………………………………...……1
1.1 研究背景…………………………….……………………...…..1
1.2 研究動機……….. ………………………………………...……3
1.3 各章介紹………………………………………………………..6
第二章理論基礎..…………………………………………………...……7

第三章LA code 建構方式……………………………………....20
3.1 LA code編碼規則及特性……………………………………..20
3.2 16脈衝之LA code間隔之驗證……………………..……….21
3.3 32脈衝之LA code間隔之驗證…….…….………….……...33
3.4 提升LA code之duty cycle……………………………………34
3.4.1 以Barker sequences提升LA code之 duty cycle……..34
3.4.2 以Optimal sequences提升LA code之 duty cycle…….44
第四章LS code建構方式…………………………..……………………62
4.1 李道本之LS code驗證…………..…………………………62
4.1.1 相同轉換方法之窗口寬度驗證………….………….70
4.1.2不同轉換方法之窗口寬度驗證………….…………81
4.2通訊系統設計實驗室LAS方案之LS code驗證……..…91
第五章LAS code分析及建構….…………….…..………...………..95
5.1長度847之LAS code建構………………..………….………95
5.1.1 長度847之LAS code建構…………..………………95
5.1.2 LS code排列方式…………………..…………..…97
5.1.3 LA code搭配基本正交互補碼之建構……….…97
5.1.4 LA code搭配通訊系統設計實驗室LS code之建構..
………….………………………………………..105
5.2變換LS code搭配通訊系統設計實驗室LS code之建構…109
5.3系統參數之評估……………………..………………………114
第六章結論及未來研究...………………..………...…………………...121
參考文獻…………………..………...……………………………..…..…124
附錄………………………………………………………………………127

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